CN103683220A - Switching device in current distribution system - Google Patents
Switching device in current distribution system Download PDFInfo
- Publication number
- CN103683220A CN103683220A CN201210419479.3A CN201210419479A CN103683220A CN 103683220 A CN103683220 A CN 103683220A CN 201210419479 A CN201210419479 A CN 201210419479A CN 103683220 A CN103683220 A CN 103683220A
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- CN
- China
- Prior art keywords
- switch
- signal
- delay
- arranging
- time
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/30—Staggered disconnection
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a switching device for current distribution. The device is provided with a switch arranged in front from the aspect of power supply and at least two switches which are directly arranged behind the switch, a trip unit which respectively triggers switches to be disconnected, digital communication connection between switches, a plurality of digital signals which comprise a delay signal, and a delay time which is given in advance. According to the digital communication connection, the switches arranged behind are connected with the switch arranged in front through a common interface. According to the plurality of digital signals, a signal is used to inform the switch arranged in front to cut current. According to the delay time which is given in advance, after the switch arranged in front receives the delay signal, the trip is delayed to the delay time. In order to ensure the protection function at any time, the following suggestions are provided that: the signals have different signal length for distinction, one signal is a cancellation signal, the delay triggered by the delay signal is ended by the reception of switch arranged in front, and the length of the cancellation signal is larger than the signal length of other signals.
Description
Technical field
The present invention relates to according to the switchgear in the electric current distribution system of claim 1 preamble.
Background technology
Known in electric current distribution system by switch particularly low-voltage power switch to individual equipment branch road (or customer), distribute electric current.The electric current that these switches are respectively rated current design and interrupt flow is crossed switch under failure condition, the electric current for example occurring when short circuit.At this, should only cut off respectively the equipment branch road breaking down or approach fault most.This behavior is called as selectively to be cut off.At least at each, from power supply, see and in the switch arranging above, have a checkout gear and a trip unit.Checkout gear by converter respectively acquisition stream cross the electric current of switch, wherein whether trip unit checking meets current condition given in advance.If so, trip unit is threaded off switch.
Known such switchgear, wherein communicates with one another for the switch selectively cutting off.So (arranging a below) switch that for example meets especially current condition because there is short circuit notifies by this switch arranging by corresponding signal above.The switch as a result of arranging above self does not disconnect immediately, but in official hour (time of delay of predetermining), waits for whether the switch arranging threads off below.If the switch arranging below is not being threaded off after above-mentioned time of delay, the switch interrupts current flowing arranging above.The switch that this avenues of communication is upwards arranged below by supplier of electricity respectively carries out.People claim that this selection mode is the Selective Control ZSS of shortening time, and it is also referred to as ZSI (Zone Selective Interlocking, zone selective interlock).
Signal can be used as digital signal and builds, known to from US7058482.
If a plurality of switches are directly set after a switch, they are for example connected with the switch arranging above by a bus by a public interface conventionally.
Shortcoming is that, in the known communication by digital signal, if two switches whiles, to the switch transmitted signal arranging, may occur uncertain state above on public interface, this may affect defencive function.
Summary of the invention
Task of the present invention is to avoid uncertain state, to can both guarantee defencive function at any time.
This task solves by the feature of claim 1; Dependent claims represents favourable design.
This solution regulation, signal by one the transfer from high state to low state and one to give each signal be (signal is specific) temporal signal length formation of distributing, a signal is cancel message, the reception by the switch arranging above of this cancel message finishes respectively the delay being triggered by inhibit signal, and the signal length of this cancel message is greater than the signal length of remaining signal.
Accompanying drawing explanation
According to an embodiment, describe the present invention in detail below.In accompanying drawing:
Fig. 1 shows an electric current distribution system, has that arrange and two switches that arrange above below,
Fig. 2 shows according to the communication connection of the switch of Fig. 1, the information that is digital signal for transmission form, and
Fig. 3 shows according to the example of the signal of Fig. 2.
Embodiment
Fig. 1 shows electric current and distributes 1, has three switches 2,3,4, and they are constructed as low-voltage power switch, and connects in power supply 5.From powering 5, switch 2 directly arranges above at two switches 3,4, and two switches 3,4 directly arrange below at switch 2.
The electric current that flows through the switch 3,4 directly arranging in the back also flows through the switch 2 arranging above.Each switch 2,3,4 automatically disconnects respectively when meeting in general a current condition given in advance, is here when over current threshold.Current threshold is for example exceeded when short circuit.
Switch 2,3,4 arranges according to hierarchical level (hierarchically), and wherein switch 2 is set up a hierarchical level (grade), and the switch 3,4 directly arranging is in the back based upon its lower hierarchical level (grade) arranging.Then the switch (not existing here) directly arranging below at switch 3,4 is set up and is positioned at the hierarchical level under it, etc.
Switch 2,3,4 is connected to each other by communicating to connect 6,7.Connect 6,7 and connect 6a, 7a realization as bus, and public bus interface 8 places of the switch 2 arranging above converge.
In Fig. 2, schematically shown the ZSI system basic structure of (or switch 2,3,4 ZSI that connects 6a, 7a by bus connects).Can find out, each switch 2,3,4 had both had communication input ZSI_IN2, ZSI_IN3, ZSI_IN4, also there is communication output ZSI_OUT2, ZSI_OUT3, ZSI_OUT4, they belong to respectively ETU/ZSI module: ETU/ZSI2, an ETU/ZSI3, ETU/ZSI4, wherein, ZSI be Zone Selective Interlocking (
signal-selectivity) abbreviation, ETU is the abbreviation of electronics trip unit (Electronic Trip Unit).Public bus interface 8 is positioned at the input ZSI_IN2 place of the switch 2 arranging above.By bus, connect 6a, 7a, the switch 2 arranging above and two switch arranging below 3,4 exchange messages, that is to say, it is here two-way connection that bus connects 6a, 7a, but the switch 3,4 that also can be configured to arrange is from behind towards the unidirectional connection of the switch 2 arranging above.
Fig. 3 exemplarily shows at this signal M (Monitor using for information exchange, supervision), U (Unlock, release), G (Ground Fault Current or earth fault), S (ShortTime Delay, short time delay), ESCD (Early Short Circuit Detection or early stage short-circuit detecting) and UL (Help helps).Signal G, S and ESCD usually belong to inhibit signal IL (Interlock, interlocking).
Signal M is corresponding to monitor message, it is for the inspection of the broken string that for example may occur, signal U corresponding to situation about for example again disappearing for short circuit for cancelling the release information of inhibit signal IL, signal S is corresponding to short time deferred message, signal ESCD identifies corresponding to early stage short circuit, signal G is corresponding to the information of the earth fault for having identified, and signal UL is corresponding to help information.
Signal M, U, G, S, ESCD and UL have digital form, and two states, consist of respectively, and their voltage level is here 0 volt (low state) or be+5 volts (high state).Signal M, U, G, S, ESCD, UL are set (that is logical one) when having low state, are not set (that is logical zero) when having high state.
In all signal M, U, G, S, ESCD, UL voltage level must be from each signal M, U, G, S, ESCD, UL, be within the time of minimum given in advance 60 μ s, to be positioned at high state its start edge.
In Fig. 3, the time span of signal M is 10 μ s (microsecond), and U is 20 μ s, and ESCD is 50 μ s, and S is 40 μ s, and G is that 30 μ s and UL are 60 μ s; That is to say, the difference of signal M, U, G, S, ESCD and UL is that time span is different.Time difference between the difference of time span or signal M, U, G, S, ESCD, UL is for example respectively 10 μ s here.
Predetermine a time of delay to each switch 2 and 3,4 of a level, so that the dropout of their delay switchs 2,3,4 after receive delay signal IL or automatically disconnection and current interruptions thus.This time of delay is all identical for all switches 2 and 3,4 difference of same one-level, and it increases towards power supply 5.
Because switch 3,4 forms nethermost level, so they are threaded off forthwith, be 0ms the time of delay that is to say them.Be for example here 50ms the time of delay of switch 2.(in the situation that distribute according to the electric current of Fig. 1, if exist the unique level of another one and its switch form nethermost level and therefore correspondingly thread off forthwith below switch 3,4, be for example 100ms the time of delay of switch 2, and are 50ms the time of delay of switch 3,4.)
Signal G, S.ESCD belongs to inhibit signal IL, they for, the time of delay of the switch that starts to arrange above by a switch arranging below, that is to say within this time and block it.
For example, if switch 3 is after sending an inhibit signal IL and also do not thread off after the time of delay of the 50ms through switch 2, switch 2 is threaded off.
Especially and in other words: if switch 3 recognizes short circuit, it by bus connect 6a, 7a to the switch 2 transmitted signal S that arrange above as inhibit signal IL, switch 2 recognizes this short circuit equally, but do not thread off, but wait in advance the time of delay to 50ms its regulation, that triggered by the reception of signal S, that is to say delay (oneself) dropout.After 50ms, if short circuit also exists all the time, switch 2 is threaded off.
If for a certain reason for example because the technical problem occurring can not be by switch 3 interruptive currents, switch 3 is again cancelled the delay of the switch arranging 2 triggering by inhibit signal IL above and is finished thus the blockade for the switch 2 arranging above by cancel message UL, so the latter threads off immediately.
The signal length of cancel message UL is always greater than the signal length of signal M, U, G, S, ESCD, that is to say, is generally also greater than the signal length of inhibit signal IL.
When two signal M, U, G, S, ESCD occur simultaneously, cancel message UL always plays a leading role, because its length also only extends by overlapping in worst situation.That is to say and do not have this danger, that is, when overlapping, produce (formations) weak (less important) signal, signal M for example, it does not make or makes too late switch 2 dropouts.
It is noted that to there is respectively one by each switch 2,3,4 it can not be lower than by the intrinsic time of delay of structures shape, and be for example 35ms at this.It must be added with the time of delay for all switches 2,3,4 above-mentioned respectively.
Claims (1)
1. a switchgear that distributes (1) for electric current, there are a switch (2) of seeing to arrange above from power supply (5) and at least two direct switches (3 arranging thereafter, 4), low-voltage power switch particularly, wherein, the electric current that flows through the switch (3,4) directly arranging in the back also flows through the switch (2) arranging above
Have a trip unit (ETU), it is automatic trigger switch disconnection respectively when meeting current condition given in advance,
The digital communication having between the switch (2,3,4) arranging above He arrange below connects (6,7), and the switch arranging is below connected with the switch arranging above (2) by a public interface (8), and
There is a plurality of digital signals (M, U, IL, UL), they consist of at least one high state and a low state, wherein, described signal (M, U, IL, UL) comprise an inhibit signal (IL), it is sent by communication connection (6,7) respectively by a switch arranging below (3,4), so as to signal that switch (2) current condition that arranges meets above and it by interruptive current, and
Have time of delay given in advance, the switch arranging above (2) will be threaded off respectively and be postponed this time of delay after receive delay signal (IL),
It is characterized in that,
By one, the transfer from high state to low state and one are each signal (M, U, IL, UL) for the temporal signal length that differentiation distributes forms to described signal (M, U, IL, UL),
A signal (M, U, IL, UL) is cancel message (UL), and the reception by the switch arranging above (2) of this cancel message finishes respectively to be said by inhibit signal (IL) delay of triggering, and
The signal length of described cancel message (UL) is greater than the signal length of remaining signal (M, U, IL).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210419479.3A CN103683220B (en) | 2012-08-30 | 2012-08-30 | Switchgear in current distribution system |
| DE201310216939 DE102013216939A1 (en) | 2012-08-30 | 2013-08-26 | Switch arrangement for use in power distribution system, has downstream switches connected with upstream switch over common interface, where signals are formed as cancellation signals whose reception completes delay by upstream switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210419479.3A CN103683220B (en) | 2012-08-30 | 2012-08-30 | Switchgear in current distribution system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103683220A true CN103683220A (en) | 2014-03-26 |
| CN103683220B CN103683220B (en) | 2017-11-07 |
Family
ID=50098683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210419479.3A Expired - Fee Related CN103683220B (en) | 2012-08-30 | 2012-08-30 | Switchgear in current distribution system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103683220B (en) |
| DE (1) | DE102013216939A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446126A (en) * | 2020-04-09 | 2020-07-24 | 华能伊敏煤电有限责任公司 | Switching device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014206249B4 (en) * | 2014-04-02 | 2023-03-23 | Siemens Aktiengesellschaft | Method for selectively turning off a switch of a switch arrangement for power distribution and corresponding switch arrangement |
| EP3154143B1 (en) * | 2015-10-07 | 2023-08-23 | GE Aviation Systems Limited | Backup overload protection scheme for solid state power controller |
| DE102022127913A1 (en) | 2022-10-21 | 2024-05-02 | Bayerische Motoren Werke Aktiengesellschaft | Protection system and method for protecting electrical and/or electronic equipment against a fault current and motor vehicle equipped accordingly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1639651A (en) * | 2002-02-25 | 2005-07-13 | 通用电气公司 | Data sample and transmission modules for power distribution systems |
| US20080198521A1 (en) * | 2007-02-20 | 2008-08-21 | Utility Relay Company | Circuit Breaker Trip Unit with Zone Selective Interlock and System Monitoring |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7058482B2 (en) | 2002-02-25 | 2006-06-06 | General Electric Company | Data sample and transmission modules for power distribution systems |
-
2012
- 2012-08-30 CN CN201210419479.3A patent/CN103683220B/en not_active Expired - Fee Related
-
2013
- 2013-08-26 DE DE201310216939 patent/DE102013216939A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1639651A (en) * | 2002-02-25 | 2005-07-13 | 通用电气公司 | Data sample and transmission modules for power distribution systems |
| CN1639939A (en) * | 2002-02-25 | 2005-07-13 | 通用电气公司 | Circuit protection system |
| US20080198521A1 (en) * | 2007-02-20 | 2008-08-21 | Utility Relay Company | Circuit Breaker Trip Unit with Zone Selective Interlock and System Monitoring |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446126A (en) * | 2020-04-09 | 2020-07-24 | 华能伊敏煤电有限责任公司 | Switching device |
| CN111446126B (en) * | 2020-04-09 | 2022-04-08 | 华能伊敏煤电有限责任公司 | Switching device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102013216939A1 (en) | 2014-03-06 |
| CN103683220B (en) | 2017-11-07 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171107 Termination date: 20200830 |
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| CF01 | Termination of patent right due to non-payment of annual fee |